|Publication number||US7344254 B2|
|Application number||US 10/811,171|
|Publication date||Mar 18, 2008|
|Filing date||Mar 26, 2004|
|Priority date||Mar 28, 2003|
|Also published as||US20040263794|
|Publication number||10811171, 811171, US 7344254 B2, US 7344254B2, US-B2-7344254, US7344254 B2, US7344254B2|
|Original Assignee||Thomson Licensing|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (8), Referenced by (3), Classifications (20), Legal Events (7)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application claims the benefit of U.S. Provisional Patent Application Ser. No. 60/458,642, entitled “COMMON LIGHT SOURCE SHARING SYSTEM” and filed Mar. 28, 2003, which is herein incorporated by reference in its entirety.
The present invention is directed to projection display devices and, more particularly to light engines for projection display devices.
There is a high demand among consumers for high-definition large screen displays such as, for example, liquid crystal displays (LCDs), digital light pulse (DLP) displays and Liquid Crystal on Silicon (LCOS) displays. Typical liquid crystal displays (LCDs) for consumer applications have SVGA resolution of approximately 600×800 pixels, although high-end projection displays have been introduced with up to 1920×1080 pixels. Displaying such low resolution on a large display yields unacceptable picture quality, for example, an SVGA display projected as a 10-foot diagonal image has a minimum pixel size of approximately ⅛-inch by ⅛-inch. Furthermore, high-definition television (HDTV) has a width to height aspect ratio of 16:9 as opposed to computer monitors and standard television, which have a width to height ratio of 4:3.
There have been several attempts to make a large size projection display, based on combining several smaller projected image “tiles” into a larger composite tiled image. For such systems, multiple projection lamps have been used, one for each “tile” displayed in the composite tiled image. Such multi-lamp projection systems have generally proved less than satisfactory, because of a lack of illumination uniformity between the tiles. This lack of illumination uniformity is typically caused because each lamp exhibits differing brightness and color characteristics as compared to the other lamps in the system. Even if matching light sources such as, for example, metal halide lamps, are chosen, the brightness and color characteristics will change as the individual lamps age.
Thus, a need exists in the art for a projection display with uniform illumination between projected image tiles in a composite tiled image.
The present invention provides a projection display with a common light source sharing system for improved illumination uniformity. A common light source is coupled through a light-dividing prism to multiple integrators. Each integrator is coupled to one or more imaging devices that project image tiles to form a larger composite tiled image.
The teachings of the present invention can be readily understood by considering the following detailed description in conjunction with the accompanying drawings, in which:
The embodiment shown in
Each integrator 330A, 330B, 330C directs a telecentric beam of light toward a projection system (not shown). The white light is then separated into its component red, green, and blue (RGB) bands of light (not shown). The RGB light may be separated by dichroic mirrors (not shown) and directed into separate red, green, and blue imagers within projection system for modulation. The modulated RGB light is then recombined by a prism assembly (not shown) and projected by a projection lens assembly (not shown) onto a display screen (not shown). Alternatively, the light from each integrator 330A, 330B, 330C may be separated into RGB bands of light in the time domain, for example, by a color wheel (not shown), and thus directed one-at-a-time into the projection system (not shown).
The integrators 430A, 430B 430C may be fiber integrator, which advantageously provide mechanical flexibility, so that the light source 410 may have a flexible location and may be located anywhere. The embodiment shown in
Although an exemplary projection system which incorporates the teachings of the present invention has been shown an described in detail herein, those skilled in the art can readily devise many other varied embodiments that still incorporate these teachings.
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|US20020001051||Feb 15, 1999||Jan 3, 2002||J. Peter Krusius||Method for assembling a tiled, flat- panel microdisplay array|
|US20020080485 *||Dec 11, 2001||Jun 27, 2002||Shinji Suzuki||Polarized light illuminator with a polarized light beam splitter|
|US20020176255 *||Apr 19, 2002||Nov 28, 2002||Satoshi Yamauchi||Illumination apparatus and a liquid crystal projector using the illumination apparatus|
|US20020191235||Jun 19, 2001||Dec 19, 2002||O'connor Michael||Projection engine|
|US20030025842||Jun 26, 2002||Feb 6, 2003||Saccomanno Robert J.||Projection system utilizing fiber optic illumination|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US8814367 *||Dec 30, 2011||Aug 26, 2014||Hae-Yong Choi||3D image cinema system|
|US9081271||Jul 8, 2014||Jul 14, 2015||Hae-Yong Choi||3D image cinema system|
|US20120188513 *||Dec 30, 2011||Jul 26, 2012||Hae-Yong Choi||3d image cinema system|
|U.S. Classification||353/81, 362/551, 353/33, 349/9, 353/82, 385/133, 359/640, 359/638, 385/36, 353/20|
|International Classification||G02B27/12, G03B21/00, G03B21/28, G02B27/14, G02B5/30, G02F1/1335, G02B6/34, F21V7/04|
|Sep 2, 2004||AS||Assignment|
Owner name: THOMSON LICENSING S.A., FRANCE
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:YOON, YOUNGSHIK;REEL/FRAME:015752/0533
Effective date: 20040510
|Sep 10, 2004||AS||Assignment|
Owner name: THOMSON LICENSING S.A., FRANCE
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:GUEUGNON, NICOLAS;BIZOT, PIERRE;GISSOT, GREGOIRE;AND OTHERS;REEL/FRAME:015784/0715
Effective date: 20040510
|Jan 22, 2008||AS||Assignment|
Owner name: THOMSON LICENSING, FRANCE
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:THOMSON LICENSING S.A.;REEL/FRAME:020407/0189
Effective date: 20080115
|Aug 8, 2011||FPAY||Fee payment|
Year of fee payment: 4
|Oct 30, 2015||REMI||Maintenance fee reminder mailed|
|Mar 18, 2016||LAPS||Lapse for failure to pay maintenance fees|
|May 10, 2016||FP||Expired due to failure to pay maintenance fee|
Effective date: 20160318